MySQL 基于GTID的主从复制示例

现有master@172.20.0.2和slave@172.20.0.3,并且已经通过mysqldump将数据同步至从库slave中. 现在在从服务器slave上配置复制链路

mysql> change master to master_host='master',master_user='repl',master_password='123456',master_auto_position=1;
Query OK,0 rows affected,2 warnings (0.06 sec)

启动复制

mysql> start slave;

启动成功后查看slave的状态

mysql> show slave statusG
*************************** 1. row ***************************
    Slave_IO_State: Queueing master event to the relay log
     Master_Host: master
     Master_User: repl
     Master_Port: 3306
    Connect_Retry: 60
    Master_Log_File: mysql-bin.000002
   Read_Master_Log_Pos: 12793692
    Relay_Log_File: relay-bin.000002
    Relay_Log_Pos: 1027
  Relay_Master_Log_File: mysql-bin.000002
    Slave_IO_Running: Yes
   Slave_SQL_Running: Yes
    Replicate_Do_DB:
   Replicate_Ignore_DB:
   Replicate_Do_Table:
  Replicate_Ignore_Table:
  Replicate_Wild_Do_Table:
 Replicate_Wild_Ignore_Table:
     Last_Errno: 0
     Last_Error:
     Skip_Counter: 0
   Exec_Master_Log_Pos: 814
    Relay_Log_Space: 12794106
    Until_Condition: None
    Until_Log_File:
    Until_Log_Pos: 0
   Master_SSL_Allowed: No
   Master_SSL_CA_File:
   Master_SSL_CA_Path:
    Master_SSL_Cert:
   Master_SSL_Cipher:
    Master_SSL_Key:
  Seconds_Behind_Master: 5096
Master_SSL_Verify_Server_Cert: No
    Last_IO_Errno: 0
    Last_IO_Error:
    Last_SQL_Errno: 0
    Last_SQL_Error:
 Replicate_Ignore_Server_Ids:
    Master_Server_Id: 101
     Master_UUID: a9fd4765-ec70-11e6-b543-0242ac140002
    Master_Info_File: mysql.slave_master_info
     SQL_Delay: 0
   SQL_Remaining_Delay: NULL
  Slave_SQL_Running_State: Reading event from the relay log
   Master_Retry_Count: 86400
     Master_Bind:
  Last_IO_Error_Timestamp:
  Last_SQL_Error_Timestamp:
    Master_SSL_Crl:
   Master_SSL_Crlpath:
   Retrieved_Gtid_Set: a9fd4765-ec70-11e6-b543-0242ac140002:1-39
   Executed_Gtid_Set: a9fd4765-ec70-11e6-b543-0242ac140002:1-4
    Auto_Position: 1
   Replicate_Rewrite_DB:
     Channel_Name:
   Master_TLS_Version:
1 row in set (0.00 sec)

当Slave_IO_Running,Slave_SQL_Running为YES,

且Slave_SQL_Running_State 为Slave has read all relay log; waiting for more updates时表示成功构建复制链路

6、总结

优点

1. 因为不用手工设置日志偏移量,可以很方便地进行故障转移
2. 如果启用log_slave_updates那么从库不会丢失主库上的任何修改

缺点

1. 对执行的SQL有一定限制
2. 仅支持MySQL 5.6之后的版本,而且不建议使用早期5.6版本

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